Marty's Ƀent Issue #701: Update on fidelity bonds Developments like fidelity bonds prove, to me, that progress is being made in the privacy department.
Marty's Ƀent Issue #539: CoinJoins, fidelity bonds & Bitcoin's (lack of) privacy In an attempt to prevent Sybil attacks which aim to deprecate individual privacy by using a single entity to dominate CoinJoins with multiple inputs, fidelity bonds force "makers" to put skin in the game.